Couple of questions.

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YTMario User
FirefoxWindows

I'm really new to using scripts and I just have a couple of questions really. I'm using this script and the questions refer to this (and most scripts in general)...
http://userscripts.org/scripts/show/101753

1. When I use a script on YouTube for example, will they detect me for the use of it and ban me? Or do they accept the use of them?

2. How can I guarantee a script won't steal my account information?

I know these are probably very nooby questions to all of you, but I'm just asking them for my peace of mind really :)

-Hugh.